"Absolutely. I think everyone on our relay team will be thinking of that," said Darrin Kelly.

"We need to support everyone who was in Boston and show them we're not going to let these events affect us," said Natasha Lightner.

Pittsburgh Marathon executive director Patrice Matamoros told Channel 4 Action News that supporters have been going on the marathon's Facebook page and making declarations about their continued commitment to run, while sending a message to the diabolical agents of hate that their confidence in humanity cannot be shaken.

"It's amazing," said Matamoros. "People and the human kindness and outpouring of support."

Some have pledged to wear ribbons, T-shirts and carry flags in honor of those killed and injured during the explosions at the Boston Marathon.

"Let's show them how tough Pittsburgh is, how tough America is. It's like a platform to fight back," said Matamoros.

Matamoros said marathon planners have been working with officials from the city, emergency management and Homeland Security for the past four years.

In Photos: 2012 Pittsburgh Marathon

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Pittsburgh Marathon 2012 - 001

Over 25,000 people took part in the 2012 Pittsburgh Marathon on Sunday in very warm weather conditions. This was the scene in downtown Pittsburgh around 7 a.m. Sunday morning. Scroll through this slideshow for photos from the course. You can also look through photos sent in by other WTAE.com users.

Pittsburgh police say they used evidence lifted from Mocospace after the suspect uploaded acts to the site. The girl told police that he knew she was only 13 and that he would stalk and harass her, waiting for her to get off the school bus.